Natural Gas & Electricity Magazine: Cogeneration for Industrial Wastewater Evaporation Has Rapid Payback

Cogeneration, also known as combined heat and power (CHP), refers to the use of both power (electrical or mechanical) and thermal energy from a single source, such as a turbine or engine. Today, there are over 4,400 cogeneration systems in the United States in a variety of applications.

Today, an innovative wastewater treatment technology is enabling an entirely new category of cogeneration application, called “CoVAP”, which stands for Cogeneration for Industrial Wastewater Evaporation. CoVAP uses the waste heat from turbines and engines to evaporate challenging wastewaters. In many cases, the evaporation results in only solids remaining (this is called Zero Liquid Discharge.) CoVAP allows companies to realize significant savings associated with managing challenging industrial waste waters.

Power Magazine: Upheaval and Innovation in Wastewater Management

Novel evaporator. A flue gas desulfurization (FGD) wastewater treatment/concentration pilot project at a 952-MW coal-fired power plant showed that Heartland Water Technology’s LM-HT Concentrator was able to use flue gas heat as an energy source to drive its evaporative process. The test concluded that the concentrator could treat and concentrate FGD wastewater, resulting in a net water volume reduction of 90% to 95% with total dissolved solid levels of more than 400,000 mg/L in the circulating fluid, and yielding a slurry containing 70% to 80% total solids. Fly ash within the flue gas provided a net benefit to the system by aiding in the management and stabilization of precipitated salts from the concentrated brine. Courtesy: Heartland Water

Cogeneration technology helps landfills reduce wastewater management costs

More than 60% of landfills dispose of their leachate by transporting it to municipal wastewater treatment plants.  Trucking costs, as well as municipal operators’ growing reluctance to accept leachate due to the challenges leachate brings to their treatment processes, are driving up costs of leachate disposal and the costs of managing a landfill.Many landfills over the past two decades have developed valuable waste-to-energy projects, generating renewable energy from the biogas created through the decomposition of organic materials within the landfill. The vast majority of these biogas-to-energy projects are ‘simple cycle’ power generation configurations – meaning the ample energy available in the hot exhaust produced by the power generation equipment is vented to atmosphere and not used beneficially. A landfill in the eastern US is using this hot exhaust energy from its biogas-to-energy plant to evaporate leachate on site using a novel solution by Heartland Water Technology. By using this freely available energy and treating leachate onsite, the landfill is taking positive control over its leachate management, generating even more value out of its renewable biogas, lowering its total cost-to-treat and significantly reducing its dependency on municipal wastewater treatment plants.